Telegraphic receiving perforator



June 20, 1944.

H. WUSTENEY ET AL TELEGRAPHI RECEIVING PERFORA'IOR Filed March 12, 1941 2 Sheets-Sheet l INVENTORS Heme/2 Wdsfeney Er/ch Lc'i/kes ATTORNEY,

June 2 1944- H. WUSTENEY ET AL TELEGRAPHIC RECEIVING PERFQRATOR Filed March 12, 1941 2 Sheets-Sheet 2 INVENTOBS Herbert Wu's fengy Erich Lc'i/kes ATTORNEY.

Patented June 20, 1944 2,352,060 TELEGRAPHIC RECEIVING PERFORATOR Herbert Wiisteney, Berlin-Wilmersdorf, and Erich Liilkes, Berlin-Staaken, Germany; vested in the Alien; Property Custodian Application March 12, 1941, Serial No. 382,856 In Germany February 16, 1940 9 Claims.

This invention relates to improvements in telegraphic receiving perforators.

When transmitting communications by'telegraphic methods, they are frequently stored in storage tapes, particularly in perforated tapes, in order to be transmitted later on. The subscriber sets of the selector central oiiices are generally equipped with so -called answer-backdevices which are released by the calling subscriber, for instance, with the aid of a particular impulse combination, the so-called who are you combination, and which then transmit the name of the subscriber. According to the service instructions, the who are you combination is transmitted by depressing a key in general immediately after the establishment of the connection. This who are you combination presents under certain circumstances difficulties in operation when using receiving perforators and tape transmitters. These difficulties are caused by the timely overlapping of the transmission of a communication from the sending to the receiving subscriber with the retransmission of the who are you combination from the receiving to the sending subscriber, and may effect a mutilation of the message, as will be explained more fully hereinafter.

The main object of the invention is to eliminate these difficulties without departing from the basic principles of operation and construction of telegraphic systems of the above-mentioned type. To this end, the invention provides a telegraphic receiver for preparing storage tapes in accordance with a communication to be retransmitted while suppressing the recording of the who are you combination. This object and the means provided by the invention for affording the desired improvement will be understood from the following description in conjunction with the appertaining drawings, in which- Fig. l is explanatory and shows diagrammatically two interconnected telegraph networks in which storing receivers according to the invention may be employed, and

Fig. 2, also of explanatory nature, a diagram of a single network also suitable for being provided with receivers according to the invention, while Fig. 3 is a perspective illustration of a receiving perforator embodying the features of the invention proper.

In order to elucidate the above-mentioned difficulties arising in the known telegraph system when applying perforating or the like receivers in cases where a who are you combination is retransmitted, and formore fully explaining the object and function of apparatus according to the invention, two examples of customary tele- .plllltel networks may at first be referred to in a general way.

Fig. 1 represents two teleprinter networks N1 and N2. N1 is, for instance, a private teleprinter exchange network whose subscribers TI and T2 may communicate with each other through an exchange oflice VAI. For example, the subscribers TI and T2 may be central offices and branch offices of a bank or the like organization, while the network N2 is a public teleprinter network. In operation, it often occurs that the subscriber Tl must transmit a communication to the subscriber T3 of the public teleprinter network, i. e. a branch exchange of a private network, which branch exchange is not a subscriber of the public teleprinter network, may desire to transmit a communication to any subscriber of the public network. This is accomplished in the manner that the subscriber Tl establishes a connection with the subscriber T2 and transmits his communication to a receiving perforator. The subscriber T2 dials the subscriber T3 over the public central exchange VA2 and transmits the perforated tape just received to this subscriber T3 with the aid of a tape transmitter. Consequently, if the subscriber Tl demands the name of the subscriber T2 with the aid of the who are you key, the who are you combination and immediately thereafter the identification signals transmitted from this apparatus are punched in the perforated tape of the subscriber T2. If now the communication stored in the perforated tape is transmitted by the tape transmitter of the subscriber T2 in the network N2, the answer-back device of the subscriber T3 is released during the transmission of the signals punched in the tape, and, since this transmission cannot be interrupted, there results a reciprocal mutilation of the answer-back signals sent by the subscriber T3 and of the signals sent by the subscriber T2 with the aid of the perforated tape.

Similar difficulties may also arise within a single network. In Fig. 2 is shown the normal lay-out of a teleprinter-connection. The subscriber TI is connected with the subscriber T2 through the connecting line Ll, the preselector VW, the group selector GW, the final selector LW, and a connecting line L2. If the subscriber T2 is engaged, a storage position SPL may be provided in a known manner to which the connection is changed over automatically. This storage position may have a receiving perforator vention removes the drawbacks by automatically the record j suppressing or rendering ineffective ing of the who are you combination. According to a more specific aspect of the in-,

- vention, and under the assumption of astand-f ardized teleprinter alphabet code teleprinter exchange traffic, the

and of the usual who are you is provided a uniformly perforated plate (not shown) in order to prevent the punches in the upper end position from being displaced in the lateral direction. The tape transport means and 2| is designed in the form of a claw 23 and embraces an eccentric 24 secured to the shaft 25.

. Theshaft 25 ends in a coupling member 23 for engaging a corresponding coupling member 21 combination is rendered ineffective by suppress ing the paper feed upon the reception of the who are you combination. If each receiverand each receiving tape recorder is provided with an answer-back device, the letter shift combination-Which, as internationally agreed, is the first combination of the answer-back signa1s follows the who are you combination. As the letter shift combination in the five-unit code contains only impulse elements which correspond, for instancefto perforations of a perforated tape, the letter shift signal is substituted for the who are you combination already perforated in the same row'.

If in particular cases no answer-back device should be connected to the receiving tape recorder, the suppression of the who are you combination, according to the invention, is caused in another manner, for instance, by suppressing the punching.

The embodiment of a receiving perforator according to the invention exemplified in Fig. 3 is adapted for use on a standard teleprinter receiver having selector bars.

paper tape l is stored in a pay-out reel 2 and fed 'to the apparatus through guide rollers 3, i. A

roller 5 is provided for the advancement of the tape. A roller 6 biased by a spring 8 is pressed against the roller 5 with the aid of a lever l which is so shaped as to'serve also as a guide for the paper tape. The roller 5 may be operated by a hand-operated stepping wheel 9, but is, as a rule, actuated in a manner to be hereinafter described through a ratchet wheel H). The tape I is guided along a tape track II. To feed the tape to the punching mechanism in an accurately uniform manner also when the width of the tape varies within small limits, a lateral wall I2 rotatable about an axis I3 is pressed against the tape by a spring l4. The'above-described tape transport means cooperate with a recording device to be described presently. Five punches 55, of which only one isillustrated, are suspended in a frame I 6. They are, when assembling the apparatus,

inserted in a gap or in bores of the frame.

The punches are of the circular cross-section but flattened at the point where they are guided in the frame so that they may be moved in both directions when threaded in the frame.

The flattened portion of the punches is somewhat longer in the longitudinal direction thereof than the width of the frame'so that there is a certain clearance in the direction of punching movement. The frame is firmly secured to the punching hammer which is guided in a bar in' a manner not shown. Below the tape is I arranged a perforated plate in a known manner (not shown) in which the punches are inserted The unperforated during the punching operation. Above the tape .coaction with the perforator. -tcr has five scanning movement by lug 4|,

signals. In the present case, in which the apparatus is designed as a perforator attachment for a teleprinter, the coupling member 25 belongs to the perforator, whereas the coupling member 21 and the shaft 30 belong to the teleprinter proper so that the drive of the apparatus is effected by the same motor as the drive of the teleprinter proper.

The transmission of the combination values is effected by means of a scanning device which comprises selector bars 3| of which five are provided in the teleprinter when employing the five unit code; Only one of these bars 3| is illustrated, since-the arrangement and operation of the others are similar as regards their The perforalevers 32 fulcrumed at 32' and disposed intermediate the five selector bars 3| and the five punches l5, respectively, only one of the scanning levers 32 being shown for the sake of clarity. Each scanning lever 32 has 2. lug 33 to contact the appertaining selector bar 3|. A'lever 34, fulcrumed about a stationary axle 35, serves to release the levers 32 against the action of springs 36, respectively, and is controlled by a cam 33 firmly mounted on shaft 25. In order to adjust the selector bars 3|, the levers 32 are released by the cam' 33 and lever 34 so that they are low- 'ered onto the selector bars 3| under the action of the springs 33 and scan the position of the selector bars 3|.

The bar 3| has an upstanding lug 4| adapted to cooperate with a downwardly extending lug 33' on the lever 32, in a manner described hereafter. If the lug 33' is not stopped in its-downward the .bell crank lever 37, which is pivotally mounted at 38, is rotated in a clockwise direction under the action of a spring 63 and pulls at its other end the control slide 39 to the left, control slide 39 being pivotally connected to the lever 31 at 40. If then the punching hammer is forced downward under the influence of eccentric, the punch l5 will not punch.

However, if the lug 33 finds a support on the extension 4| of the selector bar 3|, when the punching hammer is being lowered, the lever 32 cannot move in response to the tension of the spring 33 so that the slide 33 remains in the position shown, that is, its right hand position. In this case a hole is punched upon the downward 32 and 31 are held in engagement with each other by a spring 43 attached to an extension 42 of the lever 32.

A pawl 46 serves to advance the tape I in the case of a continuous reception. The pawl M is pivotally mounted on a lever 45 and held against the ratchet wheel it! by a spring 53. The lever '45 is rotatable about a stationary fulcrum at 45' and engages an eccentric 46 of shaft 25 under the action of a spring 47. The ratchet wheel I is stopped in the corresponding position by a detent 48 which is under the action of a spring 49. To advance the tape by hand when inserting it in the apparatus, the control wheel 9 may be employed. A lever serves to move the tape stepwise in the backward direction in case false signals have been perforated. The lever 53 has a stationary fulcrum at 59 and cooperates with two stationary stops 5! which limit the lever movements. A pawl 5i mounted on lever 56 serves to engage the ratchet wheel Iii but in general is held out of engagement by the spring H. Since in the position of rest also the pawl 44 is out of engagement with the ratchet wheel iii, the tape is moved in the reverse direction when actuating the lever 58, for instance, manually.

To facilitate the feed of the tape, the lever 2| is provided with a third arm 52 which controls a lever 53 rotatable about a stationary fulcrum at 54.

The lever 53 is provided with a pin 55 pressed against a leaf spring 56 which in turn carries the paper guide roller 3. Upon each movement of the eccentric 24 the lever 53 is rotated in counterclockwise direction, thereby pressing the spring 55 in the downward direction so that the paper is tensioned by the roller .3. If then the paper is again tensioned or stretched upon reception of the next signal the lever approaches more or less the position shown, depending upon the consumption of the paper.

To enable the scanning of certain impulse combinations, the lever 3'! is designed as part of an auxiliary scanning device, and to this end is provided with teeth 5'3. These teeth are out in the same manner as is the case with those of the selector bars, however, only for some impulse combinations. A control lever having three arms 59, 5d, 5! is rotatable about a stationary fulcrum at 69' against the action of a spring 62 and controlled by an eccentric 53 mounted on the shaft 25. Upon each rotation of the eccentric 58, the arm 58 of the three-armed control lever is released so that the lever is rotated in the clockwise direction under the influence of the spring 62 as soon as a gap between the teeth 5'! lies opposite the arm 6!. If therefore the teeth 51 are so cut that a gap is offered to arm 6! as soon as the who are you combination is received, the lever arm 65 is moved in the downward direction so that it rotates the pawl M against the action of the spring 53 in the counter-clockwise direction and the pawl 44 comes out of engagement with the ratchet wheel Hi. When the who are you combination is utilized, the ratchet wheel I0 is therefore not advanced.

In the case of the internationally standardized five-unit code, the who are you combination is allotted to the figure case and corresponds to the letter 11 The who are you combination is therefore transmitted always before the transmission of the impulse combination figure shift. Immediately after the impulse combination, "who are you follows the transmission of the answer-back impulses.

It has been internationally agreed that the answer-back signals always begin with the impulse combination letter shift. The impulse combination letter shift, however, is composed as follows: Since this impulse com bination is perforated in the same row as the who are you combination, only the letter shift combination is perforated, because the paper tape is not advanced and hence the Whole row of five markings is already punched when the who are you combination is superposed. The perforated tape contains therefore the impulse combinations figure shift and letter shif followed by the answer-back signals. The impulse combination who are you is suppressed.

As will be easily apparent from Fig. 3, instead of the advancement of the tape, the punching may be suppressed. This can be obtained, for instance, by having the lever 60 act on an intermediate member between the punch hammer 20 and the lever arm 2!. Such a construction, which is somewhat more complicated than that illustrated, would be necessary, if the tape receiver'is not associated with the answer-back device. However, such a case is rare in practice.

The invention may, of course, also be used if the storage of the impulse combinations is not effected by perforating, but in another manner. It is, for instance, possible to record impressions or embossings which are retransmitted by a photoelectric m'ethod.

What is claimed is:

1. A recording retransmission receiver for telegraph systems provided with answer-back devices for transmitting to the sending station a who are you combination of signalsidentifying the receiving station, comprising a recording device having transport means for accommodating a recording tape and recording means in cooperative relation to said transport means for recording signals on said tape in accordance with ,a communication to be retransmitted, and means responsive to said who are you combination and associated with said recording device for rendering the latter inefiective in response to the receipt of said combination so as' to prevent a permanent record of said combination on said tape.

'2. A-recording retransmission receiver for telegraph systems provided with answer-back devices for transmitting to the sending station a who are you combination of signals identifying the receiving station, comprising a recording device having transport means for accommodating a recording tape and means for recording signals on said tape, scanning means for controlling said recording means in accordance with a communication to be retransmitted, and control means disposed between said recording device and said scanning means for rendering said device ineffective in dependence upon said scanningv responding to said who are you combination whereby the recording of said combination on said tape is suppressed.

3. A recording retransmission receiver for telegraph systems provided with answer-back devices for transmitting to the sending station a who are you combination of signals identifying the receiving station, comprising drive means, transport means coupled with said drive means for accommodating a recording tape, means for recording signals on said tape, a scanning device for causing said drive means to actuate said recording means in accordance with a telegraphic communication, and control means associated with said scanning device for disengaging said transport means from said drive means in dependence upon said scanning device responding to said who are you combination in order to suppress the transport of said tape upon receipt of said combination, whereby the record of said combination is eliminated by the recording of the next following letter shift combination.

4. In a telegraph system operating with a fiveunit code and having answer-back devices for transmitting to the sending station a who are you signal of the receiving station followed by a letter shift signal of the type a recording tape receiver comprising tape feed means for accommodating a recording tape, recording means to coact with said tape, scanning means for controlling said recording means in accordance with a communication to be recorded on said tape, and control means associated with said scanning means for rendering said feed means.

ineffective upon said scanning means responding to said who are you signal so as to suppress the tape feed after the recording of said signal, whereby the latter is eliminated by the recording of the following letter shift signal.

5. In a telegraph system operating with a fiveunit code and having answer-back devices for transmitting to the sending station a fwho-are you signal of the receiving station followed by a letter shift signal of the type a recording tape receiver comprising drive means, tape feed means coupled with said drive means for transporting a recording tape, recording means to coact with said tape, scanning means for causing said drive means to actuate said recording means in accordance: with a communication to be recorded on said tape, and control means associated with said scanning means for disconnecting said drive means from said feed means in dependence upon said scanning means responding to said who are you signal so as to suppress the tape feed after the recording of said signal, whereby the latter is eliminated by the recording of the following letter shift signal.

6. A recording retransmission receiver for telegraph systems provided with answer-back devices for transmitting to the sending station a who are you combination of signals identifying the receiving station comprising a recording device havirig transport means for accommodating a recording tape and means for recording signals on said tape, main scanning means for controlling said recording means in accordance with a communication to be retransmitted, control means for rendering said recording device inef- 7. A receiving perforator for telegraph systems operating with answer-back devices for transmitting to the sending station a who are you combination of signals identifying the receiving station, comprising a recording device having transport means for accommodating a recording tape and recording means for perforating said tape, a cam shaft and drive means disposed between said cam shaft and each of said transport means and recording means respectively, scanning means for controlling said drive means so as to have said cam shaft actuate said transport means and said recording means in accordance with a communication to be recorded on said tape, means controlled by said cam shaft and associated with said scanning means for releasing said drive means so as to temporarily suppress the operation of said recording device in dependence upon said scanning means responding to said who are you combination, whereby a permanent record of said combination on said tape is prevented.

8. A receiving perforator for telegraph systems operating with answer-back devices for transmitting to the sending station a who are you combination of signals identifying the receiving station, comprising transport means for accommodating a recording tape, punching means for perforating the tape, a driving cam shaft, a controllable connection between said cam shaft and said punching means, a ratchet wheel for actuating said transport means and a drive pawl controlled by said cam shaft for advancing said ratchet wheel upon the rotation of said shaft, scanning means for controlling said connection so as to actuate said punching means in accordance with the signals to be recorded, and control means associated with said scanning means and engaging said pawl for releasing said pawl from said ratchet wheel in dependence upon said scanning means responding to said who are you combination, whereby the advance of said tape is suppressed upon the recording by said punching means of saidfwho are you combination.

9. In a telegraph system operating with a five unit code and having answer-back devices for transmitting to the sending station a who are you signal of the receiving station followed by a letter shift signal of the type a recording tape receiver comprising means for accommodating a recording tape, feed means for advancing said tape stepwise upon receipt of a signal, punching means for perforating said tape, scanning means for controlling said punching means in accordance with the signals to be recorded, common drive means for actuating said feed means and punching means, a controllable intermediate member connecting said drive means with said punching means, and control means associated with said scanning means and engaging said intermediate member for controlling said member so as to suppress the operation of said punching means in dependence upon said scanning means responding to said who are you combination, whereby the recording of said com bination is prevented.

HERBERT Wiis'rENEY. ERICH LoLKEs. 

